Funny business: the most intense comedian rivalries - In the world of comedy, not everyone can get along. In fact, it's a pretty competitive industry, with comics coming up together, only to turn into bitter rivals. There's been many comedy feuds over the years, ranging from petty put-downs to physical fights. Click on to explore the most intense comedian rivalries.

Louis C.K. vs. Dane Cook - C.K. acknowledged the allegations in a 2010 interview, saying he "didn't like" Cook and that the comedian "bummed me out aesthetically." Cook replied on the 'WTF with Marc Maron' podcast, saying he "didn't steal anything." C.K. invited Cook on his show, 'Louie,' and the two made light of the feud.

David Cross vs. Larry the Cable Guy - Larry the Cable Guy is the stage name of Dan Whitney (right), who was profiled for Rolling Stone in 2005. David Cross (left) was interviewed for the piece, and he slandered Whitney's persona and sense of humor.

Joan Rivers vs. Chelsea Handler - Apparently, Joan Rivers (left) slandered Chelsea Handler (right) at a public event. "Joan Rivers? What the f*** do I care about Joan Rivers?" she asked Howard Stern back in 2012, as a response.

Chevy Chase vs. Bill Murray - 'Saturday Night Live' hit TV screens back in 1975, and Chevy Chase (right) was one of the show's most popular stars. However, he left after the first season, and Bill Murray (left) was summoned to replace him.

Chevy Chase vs. Bill Murray - Chase returned to guest-host next season, and things got pretty tense. "I'm sure Billy wanted to take me down," Chase said in the book 'Live from the New York,' in which he also described a "fistfight that never really came to fruition."

Jon Lovitz vs. Andy Dick - Back in 1998, comedian Phil Hartman killed his wife Brynn in a murder/suicide. He had previously worked with both Dick (right) and Lovitz (left), and the latter apparently blamed Dick for Hartman's death.

Denis Leary vs. Bill Hicks and Louis C.K. - Hicks joked about the accusations, saying that he "stole his act" in 1993. Separately, C.K. called Leary a "talentless c***," and that he "stole" from him too.

Sam Kinison vs. Andrew Dice Clay - Clay (right) and Kinison (left) were on top of the comedy circuit in the early '90s. They were also bitter rivals, with Kinison calling out Clay in interviews with Howard Stern.

Katt Williams vs. Steve Harvey - Williams (left) apparently started this little feud, when he accused Harvey (right) of snubbing him in Los Angeles. Katt went on to clown Steve Harvey during a performance on New Year's Eve.

Andy Kaufman vs. Michael Richards - Andy Kaufman (left) was an extremist comedian, one who pushed the limits of conceptual comedy. He made some rare appearances during the '80s, showing up on the sketch show 'Fridays,'

Andy Kaufman vs. Michael Richards - During one sketch, Kaufman broke character, saying he felt stupid for doing the sketch. Richards responded by throwing cue cards on Kaufman's lap, getting a face full of water in return. The laughing audience were unsure if the physical altercation was genuine or not.

Funny business: the most intense comedian rivalries

The world of comedy isn't all laughs

In the world of comedy, not everyone can get along. In fact, it's a pretty competitive industry, with comics coming up together, only to turn into bitter rivals. There's been many comedy feuds over the years, ranging from petty put-downs to physical fights. Click on to explore the most intense comedian rivalries.